Yes, Best Buy usually follows Amazon's deals, for as long as Amazon has them. So really not any more of a precursor of a price drop than Amazon's deal was in the first place, just BB having to mimic for whatever period of time. Eventually the price will drop of its own accord but I'm not sure I would take Amazon's deal as necessarily heralding anything other than Amazon simply doing its thing. As usual only time will tell. When you see smaller vendors dropping as well (rather than just Amazon/BB), then that's a real price drop.
And unfortunately Amazon and BB are charging sales tax in most states now, so if you live in one of those states when you add the tax back in you aren't that much lower than 'full' price from a smaller vendor that doesn't collect sales tax. This whole thing might just be Amazon/BB trying to compete with vendors who do not charge tax.